The Diablo III Website announces a new automatic patch is now available for Diablo III to update Blizzard's action/RPG sequel to version 1.0.3.b. This is for the Americas, and users are warned this will interfere with cross-region play until all territories are in sync. Here are the patch notes:

Auction House

Bug Fixes

The "Bid" and "Buyout" buttons will now be correctly grayed-out in the confirmation window when attempting to purchase an item with insufficient gold

Bug Fixes

General

Fixed a bug where leaving a heavily-populated General chat channel would prevent players from rejoining any General chat channel until they logged out and logged back in

Fixed several tooltip-related bugs that were occurring when viewing items with 2 or more sockets in the auction house and profile pages

Fixed a rare crash with tutorials on item pickup

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And 15% of a game the size of Diablo 3 to simply integrate with a payment system seems a bit of a high estimate. I've actually done that work myself as a developer and it's not particularly difficult.

I wouldn't be surprised if it were 10+ % of the project schedule with coding and testing. You are looking at possibly millions of people banging on the RMAH and trying to hack it etc. Acti-Blizz has to be VERY careful with $$$ transactions (legal issues). Thats great that you have developed before, but I doubt you have handled code for thousands of $$ transactions. I'm sure it's more then "it's not particularly difficult". Hell, even PvP didn't make it into release...